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Low-vanadium nitrogenous hot work die steel and manufacturing method thereof

A technology for hot-working die steel and steel ingots, which is applied in the field of materials and metallurgy, and can solve problems such as large segregation tendency, restrictions on industrialization promotion, and high cost

Active Publication Date: 2021-06-29
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the overall performance of hot work die steel and prolong the service life of the die, the common alloying idea is to increase the content of noble alloy elements such as molybdenum and vanadium to improve the performance of hot work die steel such as friction and wear resistance, cold and heat fatigue resistance, etc. However, the addition of high-content noble alloy elements will inevitably bring about problems of high cost and large segregation tendency, which restrict its industrialization; therefore, the development of new hot work die steels with low cost and excellent service performance has important engineering significance and wide application prospect

Method used

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  • Low-vanadium nitrogenous hot work die steel and manufacturing method thereof
  • Low-vanadium nitrogenous hot work die steel and manufacturing method thereof
  • Low-vanadium nitrogenous hot work die steel and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0036]The composition of low vanadium nitrogen hot work die steel contains C 0.36%, Si 0.38%, Mn 0.23%, Cr 5.02%, Mo 1.55%, V 0.52%, N 0.041%, Ce 0.0025%, Mg 0.003% by mass percentage , the balance is Fe; the hardness is 51HRC, the tensile strength is 1650MPa, the yield strength is 1350MPa, and the impact absorption energy is 24J;

[0037] The preparation method is:

[0038] Industrial pure iron, molybdenum rods, metal chromium, graphite, industrial silicon, electrolytic manganese, metal vanadium and rare earth magnesium alloy are used as raw materials; industrial pure iron, molybdenum rods, metal chromium and the first part of graphite are placed in the alloy silo, pumped Vacuum and start to heat up. Before the material in the silo starts to melt, keep the vacuum degree in the silo ≤ 3Pa; when the material in the silo starts to melt, control the vacuum degree ≤ 10Pa, stop vacuuming and introduce argon to the pressure in the silo 40000Pa; after all the materials in the silo a...

Embodiment 2

[0047] The composition of low vanadium nitrogen hot work die steel contains C 0.32%, Si 0.41%, Mn 0.31%, Cr 4.95%, Mo 1.48%, V 0.5%, N 0.05%, Ce 0.007%, Mg 0.004% by mass percentage , the balance is Fe; the hardness is 53HRC, the tensile strength is 1800MPa, the yield strength is 1550MPa, the impact absorption energy is 20J, and the performance is as follows image 3 shown;

[0048] The preparation method is:

[0049] Industrial pure iron, molybdenum rods, metal chromium, graphite, industrial silicon, electrolytic manganese, metal vanadium and rare earth magnesium alloy are used as raw materials; industrial pure iron, molybdenum rods, metal chromium, graphite, industrial silicon, electrolytic manganese and metal vanadium are placed In the ladle, the melting, refining, degassing and temperature control processes are respectively completed by using the EAF-LF-VD process; after the VD process is completed, the smelted ladle returns to the LF station, and when the melt temperatur...

Embodiment 3

[0057] The composition of low vanadium nitrogen hot work die steel contains C 0.35%, Si 0.48%, Mn 0.42%, Cr 5.24%, Mo 1.36%, V 0.46%, N 0.04%, Ce 0.013%, Mg 0.005% by mass percentage , the balance is Fe; the hardness is 50HRC, the tensile strength is 1690MPa, the yield strength is 1400MPa, the impact absorption energy is 22J, and the performance is as follows image 3 shown;

[0058] Preparation method is with embodiment 2, and difference is:

[0059] (1) When the melt temperature in the ladle is 1550°C, nitrogen gas is introduced for gas phase nitriding;

[0060] (2) The soft blowing time is 20 minutes;

[0061] (3) The steel ingot is used as the consumable electrode, and the electroslag remelting method is used to melt the consumable electrode to form droplets passing through the slag pool, and to refine and purify the slag-gold reaction to obtain a remelted ingot; Heat the ingot to 1210°C and keep it warm for 11 hours for homogenization to obtain a homogeneous ingot;

...

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Abstract

The invention discloses low-vanadium nitrogenous hot work die steel and a manufacturing method of the low-vanadium nitrogenous hot work die steel. The low-vanadium nitrogenous hot work die steel comprises, by mass percentage, 0.3%-0.4% of C, 0.2%-0.6% of Si, 0.2%-0.5% of Mn, 4.5%-5.5% of Cr, 1.1%-1.7% of Mo, 0.4%-0.6% of V, 0.02%-0.07% of N, 0.005%-0.03% of Ce, 0.001%-0.006% of Mg and the balance Fe. The method comprises the following steps of (1) smelting molten steel according to the set components, and carrying out nitrogen increasing by adopting a gas-phase nitriding method, and conducting pouring operation; (2) conducting homogenizing operation at the temperature ranging from 1200 DEG C to 1250 DEG C; (3) conducting forging operation; (4) conducting normalizing operation at the temperature ranging from 1000 DEG C to 1100 DEG C; (5) conducting spheroidizing annealing operation; (6) conducting heat preservation at the temperature ranging from 1000 DEG C to 1050 DEG C, conducting oil cooling and accomplishing quenching; and (7) carrying out heat preservation at the temperature ranging from 530 DEG C to 620 DEG C for 2-6 hours twice, and conducting tempering. According to the components of the low-vanadium nitrogenous hot work die steel, the content of vanadium and the content of silicon are reduced, the proper amount of nitrogen is added, the trace amount of rare earth and the trace amount of magnesium are cooperatively added, the cleanliness of the steel is improved, the carbide distribution effect is improved, and finally the performance of the die steel is improved.

Description

technical field [0001] The invention belongs to the technical field of materials and metallurgy, and in particular relates to a low-vanadium nitrogen-containing hot work die steel and a preparation method thereof. Background technique [0002] The level of the mold industry has become one of the important symbols to measure the level of the country's manufacturing industry; hot work die steel is one of the fastest-consuming and most demanding die steels, mainly used to manufacture solid metal or high-temperature liquid metal pressing molds, Widely used in hammer forging dies, hot extrusion dies and die-casting dies. [0003] In order to improve the overall performance of hot work die steel and prolong the service life of the die, the common alloying idea is to increase the content of noble alloy elements such as molybdenum and vanadium to improve the performance of hot work die steel such as friction and wear resistance, cold and heat fatigue resistance, etc. However, the a...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C21C7/072C21D8/00C22B9/18C22C33/04
CPCC22C38/02C22C38/04C22C38/22C22C38/24C22C38/001C22C38/005C22C38/002C22C33/04C21C7/072C22B9/18C21D8/005Y02P10/25
Inventor 姜周华董君伟田家龙杨帆耿鑫姜骁箐
Owner NORTHEASTERN UNIV
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